Red Eclipse 1.4.5 - Absorption Time Trial -

Like Amplification, this is a map by the same (anonymous) author, which wasn't released until well after the 1.4 update. And again, it makes use of "crazy floor", this time in the starting room and in one avoidable spot right before the end. But the stage is a lot more orderly here, so this map is going to survive and be included in future releases.
It is the longest of the official maps, though--in fact, the only one that can't be completed in under a minute with default settings. There's just too much climbing and gap-crossing for that.